Make sure we do not write bogus reflog entries.

The file format dictates that entries are LF terminated so
the message cannot have one in it.  Chomp the message to make
sure it only has a single line if necessary, while removing the
leading whitespace.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-update-ref.c b/builtin-update-ref.c
index b34e5987dd256e0b7d9fae46fe89f66dd18ad91f..f2506fa9762bd9d868076710f38dfc9137186828 100644 (file)
--- a/builtin-update-ref.c
+++ b/builtin-update-ref.c
@@ -23,8 +23,6 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
                        msg = argv[++i];
                        if (!*msg)
                                die("Refusing to perform update with empty message.");
-                       if (strchr(msg, '\n'))
-                               die("Refusing to perform update with \\n in message.");
                        continue;
                }
                if (!strcmp("-d", argv[i])) {

diff --git a/refs.c b/refs.c
index 4323e9a41a6c2f4fe7f0dba4b53e083bd8576d50..0840b3bab8b404f9480df89447a497963b7117fb 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -925,6 +925,7 @@ static int log_ref_write(struct ref_lock *lock,
 {
        int logfd, written, oflags = O_APPEND | O_WRONLY;
        unsigned maxlen, len;
+       int msglen;
        char *logrec;
        const char *committer;
 
@@ -958,24 +959,30 @@ static int log_ref_write(struct ref_lock *lock,
                                     lock->log_file, strerror(errno));
        }
 
-       committer = git_committer_info(-1);
+       msglen = 0;
        if (msg) {
-               maxlen = strlen(committer) + strlen(msg) + 2*40 + 5;
-               logrec = xmalloc(maxlen);
-               len = snprintf(logrec, maxlen, "%s %s %s\t%s\n",
-                       sha1_to_hex(lock->old_sha1),
-                       sha1_to_hex(sha1),
-                       committer,
-                       msg);
-       }
-       else {
-               maxlen = strlen(committer) + 2*40 + 4;
-               logrec = xmalloc(maxlen);
-               len = snprintf(logrec, maxlen, "%s %s %s\n",
-                       sha1_to_hex(lock->old_sha1),
-                       sha1_to_hex(sha1),
-                       committer);
+               /* clean up the message and make sure it is a single line */
+               for ( ; *msg; msg++)
+                       if (!isspace(*msg))
+                               break;
+               if (*msg) {
+                       const char *ep = strchr(msg, '\n');
+                       if (ep)
+                               msglen = ep - msg;
+                       else
+                               msglen = strlen(msg);
+               }
        }
+
+       committer = git_committer_info(-1);
+       maxlen = strlen(committer) + msglen + 100;
+       logrec = xmalloc(maxlen);
+       len = sprintf(logrec, "%s %s %s\n",
+                     sha1_to_hex(lock->old_sha1),
+                     sha1_to_hex(sha1),
+                     committer);
+       if (msglen)
+               len += sprintf(logrec + len - 1, "\t%.*s\n", msglen, msg) - 1;
        written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
        free(logrec);
        close(logfd);